7ML19981FB05 MultiRanger 100/200 – INSTRUCTION MANUAL Page 225
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Appendix B: Tech Reference
TVT (Time Varying Threshold) curves
A TVT curve describes a threshold below which any echoes will be ignored. The default
TVT curve is used, until P837 and P838 are used to create a new ’learned TVT curve’.
Auto False-Echo Suppression
False echoes can be caused by an obstruction in the beam path (pipes, ladders, chains,
and such). Such false echoes may rise above the default TVT curve.
P838 allows you to set a distance, and P837 then instructs the Probe LU to ’learn’ where
the obstructions/false echoes are within that distance. The new TVT curve is set above
the false echoes, screening them out.
Display before Auto False Echo Suppression
(or when P837 = 0)
default TVT
P839
Hover Level
false
echo
true
echo
Distance (meters)
Level (db)
Display after Auto False Echo Suppression
TVT curve
(learned)
material
level
false
echo
Distance (meters)
Level (db)
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